Valve.



H. LENTZ.

VALVE.

APPLICATION FILED JAN. 2o, 1915.

MMT#

Huso Lnnfrz, or BERLIN-Harnlvsnn, GERMANY.

VALVE.

Application filed January 20, 1915.

To all whom 'it may concern:

' Be it known that l, HUGO LEN'rz, a citizen of the German Empire, and resident of Berlin-Halensee, Germany, have invented certain new and useful improvements in Valves, of which the following is a speciication.

My invention relates to improvements in valves, and more particularly in valves of that class, in which the inlet and outlet passages adjoining the valve gate or-plug are in the form of funnels so as to provide a nozzle, and in which the cross-sectional area of the inlet nozzle is smaller than the adjacent lcross-sectional area of the'outlet nozzle, ,so that within the chamber which receives the valve gate a vacuum is produced. One of the objects of the improvements is to provide a valve of this class, in which a small stroke of the valve gate is sufficient for opening the same, and in which the suction is comparatively large from the beginning of the opening movement of the valve gate. With this object in view my invention provides for constructing the inlet and outlet passages of the valve at the ends which are adjacent to the' gate with elongated cross-sections. In the preferred form of the valve the elongated cross-sections of the inlet and outlet 'passages are so arranged relatively to each other, that they are disposed with the walls opposite to the controlling edge of the gate in line with each other. By thus constructing the valve the larger part ofthe area of the passages comes into action for producing 'the vacuum as soon as the valve gate is moved into opening position and when a small part of thev passage is laid open.

My improved construction is further preferable as compared to constructions in which the valve gate is provided with Ia circular opening, because the chamber for receiving the valve gate can be disposed transversely of the valve casing and it can be closed at opposite Sides of the casing by means of simple caps, because by reason of the vacuum produced within the valve casing simple tightening means for the said caps are suficient.

Finally an important'advantage.o'my improved construction resides in the fact,

that the size of the valve casing is compar-I atlvely small, and that thechamber receivfing the valve plug orgate can be made in a single operation by fraising.;

Specification of Letters Patent.

Patented Mar. 3d, lllil serial-n0. 3,354.

For the purpose of explaining theinvention an example embodying the same has been shown in the accompanying drawing, inwhich the same letters of reference have been used in all theviews to indicate corresponding parts. p

In said drawing-Figure 1, is a vertical longitudinal section of the valve, showing the gate or valve in closing "position, and Fig. 2, is a `vertical cross-section taken on the line 2 2 of Fig. l. i

In the example illustrated in the drawing the valve consists of a casing a which comprises an inlet passage b and an outlet passage c which are separated from each other by a chamber d disposed transversely ofthe casing and extending from one side thereof to the other. In the manufacture of the casing I prefer to make the chamber al When casting the casing and to fashion the same afterward by fraising. At the side of the inlet passage b ofthe casing a tightening plate q of suitable hard or tempered metal is fitted in the side wall of the chamber d; The said plate can be constructed in ends. |The caps k and i are secured to the valve casing by screws k.

The cross-sections of the inlet and outlet passagesb and c are circular at their outer sides at b and c respectively and gradually merge into elongated or substantially rectilinear sections b2 and 02 at the ends which are adjacent to the plug chamber d, the longitudinal axes of the said elongated portions being transverse of the direction of the movement of the gate. The upper walls of the elongated portions of the inlet and outlet passages are located so as to register with each other, and the other walls of the outlet passage are located at a distance laterally and downward from the corresponding walls of the inlet passage, so that the uidrushing through the elongated part of the outlet passage has the function of a jet of fluid'flowing through an injector, and thereby causes a partial vacuum yWithin the chamber d. Thereby outward press-ure at the jointsk is decreased and this makes it practicable to close the casingiat both sides of the chamber al by simple caps 71. and z'.

Vithin the chamber d the valve gate is located which as shown consists of two steel plates e and 7 formed at theirl adjacent sides with cavities receiving a roller Z. The upper wall of the cavityy of the plat f is beveled at one side, so that when shi ting the said plate downward relatively tothe platev e they roller is at first inoperative by reason'of the action of the spring m, but near the end ofthe downward stroke of the gate the plate e strikes an upwardly directed flange of an` angular stop member n so as to be arrested thereby, while the plate f is moved farther downward, and the roller Z comes into. operation so as'to ride on the beveledl bottom of the cavity of the plate f and force the latter outward. Thereby the plate e is forced in tight contact with the plate g. When opening the valve gate, the plate is at first moved independently of the plate e so 'that the gate isy loosened by the action of the roller Z, and thereafter the plate f engages with a'nose f2 below a shoulder e2 formed on the plate e, so that the plate e is carried along. By thus constructing the valve gate e, f a tight joint is produced on the plate g and yet the gate can easily be moved for opening or closing the valve. `For moving the gate in the manner described a screw-threaded spindle o is provided which engages with a flange o formed at its lower end in a housing f3 formed at the top of the plate f, and which is passed through a nut 7 formed with a flange r and i'itted in the upper cap e where it is held inposition by a plate 2. The nut 1' carries a hand wheel D for rotating the same, and when thus rotated the nut shifts the gate e, f upward or downward. The ange r is formed with annular grooves s providing a tight joint between the flange and the walls of the cap i andiplate 2.

As appears from Fig. l, the valve and its casing are not larger than the usual flanges 3 and c3 by means of which the casing is secured to the pipes, so that it can be covered by the same' sheet metal jacket u as the I said pipes. Besides it can be taken apart by loosening the screws lc, so that access can be had to all the parts.

I claim herein as my invention:

1. In a valve for high pressure gaseous fluid, the combination of a casing having an inlet and an outlet passage with an'intermediate valve gate for closing communication between the two passages, said inlet passage gradually tapering down to a nozzle opening of elongated and materially reduced cross section at the gate, narrow in the direction of movement of the gate to form a nozzle to increase the velocity of the fluid at the gate, and the outlet passage being of greater cross sectionall area `at the gate than the elongated nozzle opening, whereby the flow of the ,high velocity fluid tends to create a vacuum at the gate to prevent leakage thereat. A v

2; In a valve for high pressure gaseous `fluid,the'combination of a casing having an the gate, narrow in the direction of movement of the gate to form an elongated nozzle to increase the velocity of the fluid at the gate, and the adjacent end of the outlet passage being of greater cross section than the nozzle section and having its wall adjacent the controlling edge of the gate extending beyond the corresponding wall ofthe nozzle opening, whereby a reduction in pressure at the gate iscaused by thefflow of the high velocity Huid when the gate is partially open. f f

3. In a valve for high velocity gaseous fluid, the combination of a casing having an inlet and an outletpassage with an intermediate valve gate for closing communication between the two passages, said passages each being of elongated cross section atV their adjacent ends and narrow in the direction of ,movement of the gate and each flaring outwardly with gradually and materially increasing cross section, the inner end of the outlet passage being of greater cross section than the adjacent end of the'inlet passage .whereby the gaseous fluid is delivered with `of elongated cross section at Atheir adjacent ends and narrow in the direction of movement-of the gate and each flaring outwardly with gradually and materially increasing cross section, lthe inner end of the outlet passage being of lgreater cross section than the adjacent end of the inlet passage and having its wall adjacent the controlling edge of the gate extending beyond the inner end of the corresponding wall of the inlet openarea from their outer ends toward said chamber where they are elongated in section, being narrow in the direction of movement of the gate, the sectional area of the gate chamber below the gate when in its full open position, and the cross sectional area of the outlet passage adjacent the chamber each being greater than the cross section of the adjacent end of the inlet passage, whereby the inlet passage acts as a nozzle to increase the velocity of Huid delivered at the gate and the ow of luid at high velocity past the gate produces a reduction in pressure in the gate chamber to prevent leakage.

6. In a valve, the combination of a casing substantially circular in cross section at its outer ends and tapering inwardly toward the center on at least two sides to a substantially rectangular sectional form, a chamber in the rectangular part of the cas# ing having a substantially rectangular opening at two opposite sides, and inlet and outletpassages communicating with the chamber and flaring outwardly therefrom to gradually increased cross section, a gate in the chamber, caps closing the rectangular openings at the sides of the chamber, and means 'extending through one of the caps for moving the gate.

In testimony whereof, I have signed this specification in the presence of two subscribing Witnesses.

HUGO LENTZ.

Witnesses WOLDEMAR HAUPT, HENRY HASPER. 

